WordPress: Change admin submenu's url

change_admin_submenu_url.php

<?php
$menu_key = 'edit.php?post_type=contact_form';

// Submenu's slug to be replaced.
$search = 'contact_submission';

// Url to replace the slug.
$replace = 'edit.php?post_type=contact_submission';

add_action( 'admin_menu', 'change_admin_submenu_url' );

/**
 * Change the submenu's url.
 */
function change_admin_submenu_url() {
    global $submenu;

    if ( ! isset( $submenu[ $menu_key ] ) ) {
        return;
    }

    // When exist, $submenu[$menu_key] is always array.
    foreach ( $submenu[ $menu_key ] as $index => $values ) {
        $break = false;

        if ( $values && is_array( $values ) ) {
            foreach ( $values as $key => $value ) {
                if ( $value === $search ) {
                    $submenu[ $menu_key ][ $index ][ $key ] = $replace;

                    $break = true;

                    break;
                }
            }
        }

        if ( $break ) {
            break;
        }
    }
}